you guys seen "Neither Here Nor There" The Melvins Book? The art is all over the map. Those guys appreciate a wide range of styles. A ton of their album art doesn't allude to the sounds that are actually on their recordings. The swan on the cover of Stoner Witch wouldn't let an uneducated listener know how heavy Revolve is.

Their reputation precedes them therefore you can get away with this kind of poster for them . It has everything and nothing to do with the Melvins. I think it's pretty clever and a little boring. But it works. At 20 x 26 I bet it works just fine.